Northwood Laboratory
804 Hwy 15 West
P.O. Box 510
Northwood, ND 58267
Phone: 701-587-6010
Fax: 701-587-6013
Benson Laboratory
902 13th Street North
P.O. Box 187
Benson, MN 56215
Phone: 320-843-4109
Fax: 320-843-2074
Canada Shipping Address
380 Kimberly Road
Winkler, MB R6W 0H7
Phone: 701-587-6010
Soil Science Review: Cation Exchange Capacity
/in Soil Chemical Analysis/by John BrekerEach year, AGVISE Laboratories delivers thousands of soil characterization reports with something printed on them called, “Cation Exchange Capacity (CEC).” Unless you have some background in soil science or surface chemistry, the number might be a mystery to you. Cation exchange capacity is the amount of positive-charged cations (e.g. ammonium, calcium, hydrogen, magnesium, potassium, sodium) […]
Molybdenum: The Micro-est of Micronutrients
/in Molybdenum, Plant Analysis, Soil Chemical Analysis/by John BrekerMolybdenum (Mo) is an essential plant nutrient, necessary for nitrate assimilation and biological nitrogen fixation. Legumes, relying on symbiotic nitrogen fixation, have greater Mo requirement than non-legumes. Nevertheless, the Mo requirement of plants is the lowest among all micronutrients, with critical deficiency concentrations ranging from 0.1 to 1.0 ppm in plant leaves. The very low […]
Fertilizing soybean
/in Iron, Nitrogen, Phosphorus, Potassium, Soybean, Sulfur, Zinc/by Richard JennySoybean acres expanded greatly across the northern Great Plains and into Manitoba through the 1990s and 2000s. Today, soybean occupies a large portion of planted acres and makes a desirable rotation crop in canola, corn, and small grain production systems. As soybean has advanced northward and westward, soybean is often billed as a low maintenance […]
Copper for Small Grains
/in Copper, Disease, Wheat/by John LeeAmong crops grown in the northern Great Plains, small grains (cereals) are the most susceptible to copper deficiency. Copper (Cu) is an essential micronutrient required in small concentrations for plant growth and reproduction. Copper deficiency symptoms in cereals include pale yellowing, wilted and twisted leaf tips, and malformed seed heads. Severe copper deficiency will stop […]
Caution: Ammonium Sulfate with Seed
/in Canola, Fertilizer Placement, Phosphorus, Starter Fertilizer, Sulfur/by John LeeSeed-placed fertilizer is a common practice to increase seedling vigor and optimize fertilizer placement and crop response. This is a popular strategy to apply phosphorus for canola, corn, and wheat. However, the seed-placed fertilizer rate cannot exceed seed safety limits, otherwise seedling germination and plant population may be reduced. Sulfur is very important in canola […]
AGVISE Laboratories: Trusted by University and Industry Researchers
/in Quality Control, Research/by John LeeWhile you may know AGVISE Laboratories for the soil and plant analysis services we provide you and your producers, AGVISE also has a long history of supporting university and industry research. For the past 30 years, many university-operated soil testing laboratories have closed in the region. This has left a gap in the on- and […]
5 Things You Should Know About Phosphorus
/in Phosphorus, Regional Data, Soil Chemical Analysis/by John Lee1. The two accepted soil phosphorus tests in the North Central Region are the Olsen and Bray-P1 methods The Olsen (bicarbonate) method is the standard soil P test in the North Central region. This method was developed to work on soils with low and high pH. The Olsen method works well in precision soil sampling, […]
5 Things You Should Know About Calcium
/in Base Cation Saturation Ratio, Calcium, Regional Data, Soil Chemical Analysis, Soil pH/by John Lee1. Calcium (Ca) is abundant in soils of the upper Midwest, northern Great Plains, and Canadian Prairies; calcium deficiency in agronomic crops is rare Calcium makes up about 3.6% of the Earth’s crust, and it is relatively abundant in agricultural soils across the region. In soils with pH greater than 6.0, Ca is the dominant […]
Soybean Iron Deficiency Chlorosis: Symptoms, Causes, and Management
/in Iron, Soybean/by John BrekerIf soybean turns yellow during an early growth stage, you may have a case of soybean iron deficiency chlorosis (IDC). The distinctive yellow symptoms of soybean IDC often appear as soybean enters the first- to third-trifoliate leaf stage. Soybean IDC is characterized by distinct interveinal chlorosis (yellow leaf with green leaf veins) in the […]
Fallow Syndrome: Preventing Phosphorus Problems
/in Canola, Cover Crop, Phosphorus, Prevented Planting, Soil Health, Starter Fertilizer, Sugar Beet/by Jodi BoeProducers in the northern Great Plains and upper Midwest need to consider the risk of fallow syndrome in their crop nutrition plans. You are probably asking, what is “fallow syndrome” and why should I care? After all, summer fallow is not that common anymore! But the greater number of Prevented Planting acres in 2019 and […]
Field Variability Screaming in Your Ear? Precision Soil Sampling is the Answer
/in Precision Ag/by Jodi BoeYour land is variable. Each fall, you watch the combine yield monitor go up and down across the field. You know where crop yield will be the best in wet years and dry years. So, why do you still use a whole-field composite soil test to manage fertilizer inputs and ignore the obvious field variability […]
Prevented Planting Acres in 2020: Maximizing Cover Crop Effectiveness
/in Cover Crop, Prevented Planting, Soil Erosion, Soil Health, Tillage, Water Quality, Weed/by John BrekerIn 2020, there are again widespread acres of Prevented Planting (PP) in North Dakota and northwest Minnesota. Farmers are now making plans to plant cover crops on unplanted cropland in the next few weeks. It is important to establish cover crops on PP fields because growing plants help reduce the chance these fields will be […]
Plant Analysis Sampling Guide
/in Plant Analysis/by John BrekerPlant nutrient analysis is a useful management tool. The AGVISE Plant Analysis Sampling Guide discusses the importance of plant analysis in proper crop nutrition and how to collect plant samples. It is important to collect the correct plant part at the correct plant growth stage to ensure accurate interpretation of plant analysis results. To ensure […]
High Soil Nitrogen following Drought: How to manage next year
/in Drought, Nitrogen, Regional Data, Wheat/by John LeeFrom time to time, moderate to severe droughts hit the Great Plains. Such is life in semi-arid climates. When a drought occurs, it is normal to find higher residual soil nitrate-nitrogen after harvest. Since the widespread adoption of soil testing in the 1970s, we have seen this phenomenon in all major drought years: 1988, 2002, […]